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x in (-oo:+oo)
y+1 = (9/7)*x-6 // - (9/7)*x-6
y-((9/7)*x)+1+6 = 0
(-9/7)*x+y+1+6 = 0
y-9/7*x+7 = 0 // - y+7
-9/7*x = -(y+7) // : -9/7
x = (-(y+7))/(-9/7)
x = 7/9*(y+7)
x = 7/9*(y+7)
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